package demo5;

import java.util.Comparator;

class Student implements Comparable<Student>{
    public String name;
    public int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public int compareTo(Student o) {
        return this.age - o.age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

class AgeComparator implements Comparator<Student> {
    public int compare(Student o1,Student o2) {
        return o1.age - o2.age;
    }
}

class NameComparator implements Comparator<Student> {
    public int compare(Student o1,Student o2) {
        return o1.name.compareTo(o2.name);
    }
}

public class Test {
    public static void main(String[] args) {
        Student student1 = new Student("zhangsan",10);
        Student student2 = new Student("lisi",12);

        System.out.println(student1.compareTo(student2));
        AgeComparator ageComparator = new AgeComparator();
        System.out.println(ageComparator.compare(student1, student2));

        NameComparator nameComparator = new NameComparator();
        System.out.println(nameComparator.compare(student1,student2));

    }
}

